Soon after his removal to Boston he joined the Ancient and Honorable Artillery Company. In 1856 he was chosen commander of the corps, having four times previously declined nominations. He entered into correspondence with Prince Albert, commander of the Royal Artillery Company of London, founded in 1537, of which this corps, chartered in 1638, is the only offspring. This correspondence established a friendly intercourse between the two companies. In June, 1857, Prince Albert was chosen a special honorary member of our company, and twenty-one years later, in 1878, Col. Wilder, who then celebrated the fiftieth or golden anniversary of his own membership, nominated the Prince of Wales, the present commander of the London company, as an honorary member. They are the only two honorary members that have been elected by the company, and both were commanders of the Honorable Artillery Company of London when chosen. The late elegantly illustrated history of the London company contains a portrait of Col. Wilder as he appeared in full uniform on that occasion. In 1839, he was induced to serve for a single term in the Massachusetts legislature as a representative for the town of Dorchester. In 1849 he was elected a member of Gov. Briggs's council, and the year following, a member of the senate and its president. In 1860, he was the member for New England of the national committee of the "Constitutional Union party," and attended, as chairman of the Massachusetts delegation, the National convention in Baltimore, where John Bell and Edward Everett were nominated for president and vice-president of the United States. He was initiated in Charity Lodge No. 18, in Troy, N. H., at the age of twenty-five, exalted to the Royal Arch Chapter, Cheshire No. 4, and knighted in the Boston Encampment. He was deputy grand master of the Grand Lodge of Massachusetts, and was one of the six thousand Masons who signed, Dec. 31, 1831, the celebrated "Declaration of the Freemasons of Boston and Vicinity;" and at the fiftieth anniversary of that event, just celebrated in Boston, Mr. Wilder responded for the survivors, six of the signers being present. He has received all the Masonic degrees, including the 33d, or highest and last honor of the fraternity. At the World's Masonic convention, in 1867, at Paris, he was the only delegate from the United States who spoke at the banquet. On the 7th of November, 1849, a festival of the Sons of New Hampshire was celebrated in Boston. The Hon. Daniel Webster presided, and Mr. Wilder was the first vice-president. Fifteen hundred sons of the Granite State were present. The association again met on the 29th of October, 1852, to participate in the obsequies of Mr. Webster at Faneuil Hall. On this occasion the legislature and other citizens of New Hampshire were received at the Lowell depot, and addressed by Mr. Wilder in behalf of the sons of that state resident in Boston.